Least represented/known model or datasheet?

Like the title says, what's your vote on a model or datasheet in Necromunda that is unknown or never ever sees any representation?

My vote would go to the Van Saar Arachnotek Golem. Doesn't have a model and if I'm being honest I'd never heard of it in a number of years being into Necromunda until literally yesterday. Don't think I've ever heard anyone talk about it or use it or acknowledge its existence.